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    ALMA Observations of Starless Core Substructure in Ophiuchus

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    Kirk_2017_ApJ_838_114.pdf
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    Author
    Kirk, H. cc
    Dunham, M. M. cc
    Francesco, J. Di cc
    Johnstone, D.
    Offner, S. S. R.
    Sadavoy, S. I. cc
    Tobin, John cc
    Arce, Hector cc
    Bourke, T. L.
    Mairs, S.
    Myers, P. C. cc
    Pineda, J. E. cc
    Schnee, S.
    Shirley, Y. L.
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    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-03-31
    Keywords
    Stars: formation
    submillimeter: ISM
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    ALMA Observations of Starless Core Substructure in Ophiuchus 2017, 838 (2):114 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Compact substructure is expected to arise in a starless core as mass becomes concentrated in the central region likely to form a protostar. Additionally, multiple peaks may form if fragmentation occurs. We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 2 observations of 60 starless and protostellar cores in the Ophiuchus molecular cloud. We detect eight compact substructures which are >15 '' from the nearest Spitzer young stellar object. Only one of these has strong evidence for being truly starless after considering ancillary data, e.g., from Herschel and X-ray telescopes. An additional extended emission structure has tentative evidence for starlessness. The number of our detections is consistent with estimates from a combination of synthetic observations of numerical simulations and analytical arguments. This result suggests that a similar ALMA study in the Chamaeleon. I cloud, which detected no compact substructure in starless cores, may be due to the peculiar evolutionary state of cores in that cloud.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aa63f8
    Version
    Final published version
    Sponsors
    Canada Foundation for Innovation
    Additional Links
    http://stacks.iop.org/0004-637X/838/i=2/a=114?key=crossref.627d77d65fd59c41e3c554d948120b5b
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aa63f8
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    UA Faculty Publications

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